Alan, so far on my six pack, I have only bought the frames ($20.00 for the 2) screws, glue and liqued nails.
The 3/4 ply for the floors was free, I reused the 2x2 from the 2 campers torn down, and 80% of the wood is......2x4 s from the 8 foot pallets that we get large orders on at Wal-Mart... OH and I ripped 2 2x12s down to 1/8th in strips to make the glue lam frame...The 2x12s were the platforms on some scaffolding that we used at Wal-Mart to re-paint the front of the store.
Now I am hoping to come up with some free 1/4 ply from somewhere.
I have a boatload of 1 inch blue styro insulation scraps, but willo need to come up with more... time to call some old contractor friends
It CAN be done.... just have to scavenge like mad, and see the good in any old piece of junk lying around.